Modeling of heat transfer and differential diffusion in transported PDF methods

Fiolitakis, Andreas; Ess, Peter; Gerlinger, Peter; Aigner, Manfred

doi:10.1016/j.combustflame.2014.01.021

Cited by 14 publications

(21 citation statements)

References 35 publications

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“…As we consider subfilter modeling to be important for more detailed investigations, the present QLC-LES simulation and our experience in TCI modeling (Fiolitakis et al, 2014;Gerlinger, 2003Gerlinger, , 2017Gerlinger et al, 2001Gerlinger et al, , 2005 will serve as a starting point for future works which will address the treatment of soot subfilter dynamics.…”

Section: Governing Equationsmentioning

confidence: 99%

Toward finite-rate chemistry large-eddy simulations of sooting swirl flames

Eberle

Gerlinger

Geigle

et al. 2018

Combustion Science and Technology

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This paper presents time-resolved numerical simulations of a well-characterized sooting swirl flame at elevated pressure. Recently published unsteady Reynolds averaged Navier-Stokes simulations (URANS) are compared here to newly performed large eddy simulations (LES). Finite-rate chemistry, where transport equations are solved for each chemical species, is employed for the gas phase, a sectional approach for polycyclic aromatic hydrocarbons (PAHs), and a two-equation model for soot particles. Feedback effects such as the consumption of gaseous soot precursors by growth of soot and PAHs are inherently captured accurately by a coupled solution of the set of governing equations. The numerical results (velocity components, temperature and soot volume fraction) compare well with experimental data. No significant differences between URANS and LES are observed for timeaveraged temperatures and velocity components, while the prediction of soot is significantly improved by LES. It will be shown that an accurate description of the instantaneous flame structure (especially of the hydroxyl radical distribution) by resolution of turbulent scales is of fundamental importance for accurate soot predictions in confined swirl flames with strong secondary air injection.

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Section: Governing Equationsmentioning

confidence: 99%

Toward finite-rate chemistry large-eddy simulations of sooting swirl flames

Eberle

Gerlinger

Geigle

et al. 2018

Combustion Science and Technology

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“…It was specifically developed to resolve acoustic oscillations in gas turbine combustion chambers [37] and is thus applied in the present simulation. Furthermore, various models for turbulence (URANS, LES, hybrid LES/RANS), combustion [38,39,40,41] and soot formation [42,43,44] are available. Additionally, THETA can be coupled with a Lagrangian multiphase method [45].…”

Section: Theta Code and Numerical Meshmentioning

confidence: 99%

Scale Adaptive Simulation of a thermoacoustic instability in a partially premixed lean swirl combustor

Lourier

Stöhr

Noll

et al. 2017

Combustion and Flame

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The thermoacoustic oscillation of a turbulent, swirl-stabilized, partially premixed flame in the PRECCINSTA gas turbine model combustor is analyzed by means of a Scale Adaptive Simulation (SAS) method. In the critical regions of the combustor the SAS features a fine spatial resolution and thus corresponds to a Large Eddy Simulation (LES). Two combustion models are applied, a simple eddy dissipation model and a detailed finite rate chemistry (FRC) model. A previous LES for the same combustor by Franzelli et al. [Combust. Flame 159 (2012) 621-637] indicated that the acoustic impedance of the fuel supply plays a critical role. Therefore in the present work, the fuel channels and fuel plenum are included in the computational domain and thereby the fuel inlet impedance is inherently taken into account. The resulting fields of velocity, temperature and mixture fraction fit well to experimental data with a slightly better agreement for the detailed FRC model. For both combustion models the computed frequency of the thermoacoustic oscillation is close to the experimental value, whereas its amplitude is significantly overestimated by about 15 dB in comparison to measurements. The reason for this overestimation is analyzed using an additional measurement where acoustic damping due to vibrating side walls is suppressed. For the latter experiment both frequency and amplitude agree well with CFD results, which indicates that acoustic damping effects must be carefully taken into account for validation of CFD. The 3D time-resolved simulations further provide detailed insights into the interaction of flow and mixing in the swirler, which leads to a convective time-lag between oscillations of velocity and equivalence ratio in the flow of unburned gas that largely affects the heat release response of the flame. Taken together, the results show that SAS computations can accurately reproduce frequency and amplitude of thermoacoustic oscillations of turbulent partially premixed flames in a gas turbine combustor provided that proper modeling of fuel supply and acoustic boundary conditions is applied.

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“…The closure of the diffusion terms in Eq. 1is accomplished by employing the modified Curl model [13][14][15] in conjunction with a diffusion model that accounts for mean molecular diffusion transport in composition space [16]. It was found that the modified Curl model has a favorable effect on the stabilization of the flame and was preferred to simpler mixing models, e.g.…”

Section: B Tpdf Modelingmentioning

confidence: 99%

“…Particle quantities are denoted by an asterisk ( * ). The quantitiesṼ h andṼ Y α describe the mean molecular drifts in composition space [16], which are defined as…”

Section: B Tpdf Modelingmentioning

confidence: 99%

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Simulation of a Piloted Turbulent Sooting Jet-Flame using a Transported-PDF and a Sectional Soot Modeling Approach

Dittmann

Fiolitakis

Gerlinger

et al. 2019

AIAA Scitech 2019 Forum

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In this work a Reynolds-averaged Navier-Stokes (RANS) simulation of a piloted turbulent ethylene/air jet flame is presented that combines a transported probability density function (TPDF) combustion modeling approach for the thermochemical PDF with a contemporary soot model. The soot model uses a sectional approach and a reversible model for the polycyclic aromatic hydrocarbons (PAH) that has been developed recently. Both models have been tested in earlier works successfully and they are known to have superior properties compared to simpler model approaches. In this work the TPDF and sectional soot model approaches are combined in order to predict the soot yield more accurately. Results are compared to the experiment and to an additional simulation using a standard combustion model. It is shown that the TPDF model predicts the soot volume fraction distribution better than the standard model.

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Modeling of heat transfer and differential diffusion in transported PDF methods

Cited by 14 publications

References 35 publications

Toward finite-rate chemistry large-eddy simulations of sooting swirl flames

Toward finite-rate chemistry large-eddy simulations of sooting swirl flames

Scale Adaptive Simulation of a thermoacoustic instability in a partially premixed lean swirl combustor

Simulation of a Piloted Turbulent Sooting Jet-Flame using a Transported-PDF and a Sectional Soot Modeling Approach

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